Portable circular saw for cutting metal

Abstract

The utility model discloses a portable circular saw for cutting metal. The portable circular saw comprises a base and a cutting machine body, wherein the base is provided with a lower surface side and abuts against a cutting material, and the cutting machine body is at least partially supported on the upper surface side of the base; the cutting machine main body comprises a circular saw blade and a fixed protective cover which covers the outer side of the circumference of the circular saw blade; the metal chip guide pipe is arranged in the fixed protective cover, surrounds the outer side of part of the circumference of the circular saw blade and comprises a chip guide cavity for guiding cuttings and an inlet communicated with the chip guide cavity; the movable shield rotates relative to the fixed shield and can cover the outer side of part of the circumference of the circular saw blade; a guide part is arranged in the fixed protective cover and close to the inlet, and cuttings blown from the cutting point are guided to the inlet; when the portable circular saw is used for cutting, at least part of the guide part extends from the bottom of the inlet to the first open end close to the movable protective cover. By the adoption of the technical scheme, the portable circular saw with the lower protective cover not prone to deformation or melting can be provided.

Description

TECHNICAL FIELD

[0001] The present application relates to the field of electric tools, in particular to a portable circular saw for cutting metal. BACKGROUND

[0002] The circular saw can be used to cut metal and is a toothed tool. The circular saw generates metal chips during cutting. A lower shroud and a dust collection assembly for collecting metal chips are provided on the circular saw. The lower shroud is a movable shroud that rotates with the cutting condition of the circular saw blade. During cutting, metal chips may not enter the dust collection assembly and fall off, at which time the metal chips have a probability of falling to the lower shroud and causing the lower shroud to deform or melt.

[0003] This section provides background information relating to the present application, which is not necessarily prior art. CONTENT OF THE INVENTION

[0004] One object of the present application is to solve or at least alleviate part or all of the above problems. To this end, one object of the present application is to provide a portable circular saw in which the lower shroud is not easily deformed or melted.

[0005] To achieve the above object, the present application adopts the following technical solutions:

[0006] In some embodiments, a portable circular saw for cutting metal includes:

[0007] a base having a lower surface side abutting against a cutting material, and a cutting machine body supported at least partially on an upper surface side of the base; the cutting machine body includes:

[0008] a circular saw blade protruding downward through a window portion provided on the base and cutting into the cutting material;

[0009] a fixed shroud covering a circumferential outer side of the circular saw blade;

[0010] a metal chip guide tube provided in the fixed shroud and surrounding a portion of the circumferential outer side of the circular saw blade, including a chip guide cavity and an inlet communicating with the chip guide cavity;

[0011] a movable shroud rotating relative to the fixed shroud and capable of covering a portion of the circumferential outer side of the circular saw blade;

[0012] a guide portion provided in the fixed shroud near the inlet to guide the chips blown from the cutting point to the inlet;

[0013] At least a portion of the guide portion extends from the bottom of the inlet to the first opening end near the movable shroud when the portable circular saw is cutting.

[0014] In some embodiments, the guide portion is further connected or formed with a support portion that fixes the metal chip guide tube and the fixed shroud.

[0015] In some embodiments, the fixed shroud is integrally formed with the support portion.

[0016] In some embodiments, the guide portion is integrally formed with the metal chip guide tube.

[0017] In some embodiments, the metal chip guide tube is integrally formed.

[0018] In some embodiments, the guide portion is provided in a flat plate shape, and includes a slit formed by cutting from a lower end thereof to allow the circular saw blade to enter the slit.

[0019] In some embodiments, the movable shroud has a first side portion and a second side portion, and a bottom portion connecting the first side portion and the second side portion; and the guide portion abuts against the first side portion and the second side portion, respectively, when the portable circular saw is cutting.

[0020] In some embodiments, in a radial direction of the circular saw blade, the distance between the bottom portion of the guide portion and the center of the circular saw blade is greater than 75 mm and less than or equal to 79 mm.

[0021] In some embodiments, a portable circular saw for cutting metal includes:

[0022] a base having a lower surface side that abuts against a cutting material, and a cutting machine body supported at least partially on an upper surface side of the base;

[0023] the cutting machine body includes:

[0024] a circular saw blade protruding downward from the lower surface side via a window portion provided on the base and cutting into the cutting material;

[0025] a fixed shroud covering an outer side of a circumference of the circular saw blade;

[0026] a chip guide tube provided inside the fixed shroud and surrounding a portion of an outer side of a circumference of the circular saw blade, including a chip guide cavity that guides a chip and an inlet that communicates with the chip guide cavity;

[0027] a guide portion provided inside the fixed shroud near the inlet to guide the chip blown up from a cutting point to the inlet;

[0028] the guide portion is further formed or connected with a support portion that fixes the metal chip guide tube and the fixed shroud.

[0029] In some embodiments, the fixed shroud is integrally formed with the support portion.

[0030] The application has the beneficial effects that: by setting the guide part at the entrance of the fixed shroud, and the guide part extends towards the first opening end of the movable shroud, so that the guide part guides as many cuttings as possible into the metal chip guide pipe during cutting, thereby reducing the probability of cuttings falling into the movable shroud (lower shroud), so that the movable shroud is not easy to deform or melt. BRIEF DESCRIPTION OF DRAWINGS

[0031] Figure 1 is a perspective view of a circular saw of an embodiment;

[0032] Figure 2 is Figure 1 is another perspective view of the circular saw from another angle;

[0033] Figure 3 is Figure 1 is a partial perspective exploded view of the fixed shroud and the chip collection assembly of the circular saw;

[0034] Figure 4 is Figure 1 is a side view of the circular saw;

[0035] Figure 5 is a top view of the circular saw of an embodiment including a seal;

[0036] Figure 6 is Figure 5 is a perspective view of the seal;

[0037] Figure 7 is Figure 2 is a partial enlarged view of the secondary handle;

[0038] Figure 8 is a perspective view of the circular saw of an embodiment including a first section and a second section;

[0039] Figure 9 is Figure 8 is a side view of the fixed shroud;

[0040] Figure 10 is Figure 8 is a side view of the lower end portion;

[0041] Figure 11 is Figure 8 is a chip movement trajectory diagram corresponding to the first section and the second section;

[0042] Figure 12 is a perspective view of the lower end portion and the base of the circular saw of an embodiment;

[0043] Figure 13 is Figure 12 is a top view of the lower end portion and the base;

[0044] Figure 14is a perspective view of a fixed guard and metal chip tube of a circular saw of an embodiment;

[0045] Figure 15 is a front side view of Figure 14

[0046] Figure 16 is an exploded perspective view of the fixed guard of Figure 14

[0047] Figure 17 is a perspective view of a circular saw including a support portion in Figure 16

[0048] Figure 18 is a schematic view of a hook assembly rotated 90 degrees in Figure 1

[0049] Figure 19 is a schematic view of a hook assembly rotated 180 degrees in Figure 1 DETAILED DESCRIPTION

[0050] Before any embodiments of the application are explained in detail, it is to be understood that the application is not limited in its application to the details of construction and the arrangement of components set forth in the following description or illustrated in the above-described accompanying drawings.

[0051] In this application, the terms "including", "containing", "having" or any other similar words are intended to encompass non-exclusive inclusions, so that the process, method, article or device including a series of elements not only includes those elements, but also includes other elements not explicitly listed, or further includes elements inherent to such process, method, article or device. Without more limitations, the element defined by the statement "including a" does not exclude the existence of other identical elements in the process, method, article or device including the element.

[0052] In this application, the term "and / or", is a description of the association relationship between the associated objects, which means that there can be three kinds of relationships. For example, A and / or B, can represent: A exists alone, A and B exist together, B exists alone, these three cases. In addition, the character " / " in this application generally represents that the front and rear associated objects are a "and / or" relationship.

[0053] ​​​​​In this application, the terms "connected", "coupled", "engage", "engagement", "mounting" can be direct connection, coupling or mounting, or indirect connection, coupling or mounting. Among them, for example, direct connection refers to the connection of two parts or components without the need for an intermediate part, and indirect connection refers to the connection of two parts or components with at least one intermediate part. In addition, "connection" and "coupling" are not limited to physical or mechanical connection or coupling, and can include electrical connection or coupling.

[0054] In this application, those of ordinary skill in the art will understand that the relative terms used in connection with the quantity or condition (for example, "about", "approximately", "substantially" and the like) include the value indicated and have the meaning indicated by the context. For example, the relative terms at least include the degree of error related to the measurement of a specific value, the tolerance caused by manufacturing, assembly, use, etc. related to a specific value. Such terms should also be considered to disclose the range defined by the absolute values of the two endpoints. The relative term can refer to the addition or subtraction of a certain percentage (for example, 1%, 5%, 10% or more) of the indicated value. The numerical value without the relative term should also be disclosed as a specific value with a tolerance. In addition, "substantially" when expressing the relative angular positional relationship (for example, substantially parallel, substantially perpendicular), it can refer to the addition or subtraction of a certain degree (for example, 1 degree, 5 degrees, 10 degrees or more) based on the indicated angle.

[0055] In this application, those of ordinary skill in the art will understand that the functions performed by the components can be performed by one component, multiple components, one part, or multiple parts. Similarly, the functions performed by the parts can also be performed by one part, one component, or multiple parts in combination.

[0056] In this application, the terms "upper", "lower", "left", "right", "front", "back" and the like are described in the orientation and positional relationship shown in the drawings, and should not be understood as limiting the embodiments of the present application. In addition, it should also be understood in the context that when referring to one element connected to another element "on" or "under", it can not only be directly connected to another element "on" or "under", but also indirectly connected to another element "on" or "under" through an intermediate element. It should also be understood that the terms "upper", "lower", "left", "right", "front", "back" and the like not only represent the positive direction, but also can be understood as the side direction. For example, the lower side can include the directly below, the left below, the right below, the front below and the back below, etc.

[0057] The present application provides a circular saw 100, in particular a portable circular saw for cutting metal. As shown in Figure 1 and Figure 2As shown, the circular saw 100 comprises a base 110, a handle assembly 120, a driving mechanism 130, a battery pack 140 and a cutter main body 100a. Among them, the cutter main body 100a is at least partially supported on the upper surface side of the base 110, and the cutter main body 100a comprises a circular saw blade 200, a fixed guard 300, a movable guard 400 and a dust collection assembly 500. In order to clearly illustrate the technical solutions of the present application, the following definitions are also made as shown in the upper side, lower side, left side, right side, front side and rear side. Among them, the cutting advancing direction of the circular saw 100 is the front, then the corresponding direction is the rear, the left side of the cutting advancing direction is the left, and the right side of the cutting advancing direction is the right. Figure 1 As shown, the circular saw 100 comprises a base 110, a handle assembly 120, a driving mechanism 130, a battery pack 140 and a cutter main body 100a. Among them, the cutter main body 100a is at least partially supported on the upper surface side of the base 110, and the cutter main body 100a comprises a circular saw blade 200, a fixed guard 300, a movable guard 400 and a dust collection assembly 500. In order to clearly illustrate the technical solutions of the present application, the following definitions are also made as shown in the upper side, lower side, left side, right side, front side and rear side. Among them, the cutting advancing direction of the circular saw 100 is the front, then the corresponding direction is the rear, the left side of the cutting advancing direction is the left, and the right side of the cutting advancing direction is the right.

[0058] The base 110 is a supporting platform for the entire circular saw 100. When the circular saw 100 cuts metal materials, the lower surface of the base 110 can abut against the cutting materials to position the circular saw 100 and the cutting materials and support the circular saw 100 to a certain extent. Pushing the circular saw 100 forward with the base 110 abutting against the cutting materials can make the circular saw 100 cut the metal materials.

[0059] The handle assembly 120 is arranged on the upper side of the base 110, and a user holds the handle assembly 120 to facilitate the operation of the circular saw 100. The handle assembly 120 comprises a main handle 121 and a sub-handle 122. The main handle 121 is arranged obliquely to facilitate pushing the circular saw 100 from the rear to the front for cutting operation. The sub-handle 122 is arranged at the front end of the main handle 121 as shown in the figure. Figure 1 The sub-handle 122 is used to assist in holding the circular saw 100 during cutting. When the circular saw 100 is used for cutting operation, the user holds the main handle 121 with one hand and holds the sub-handle 122 with the other hand, so that the operation is more stable. Figure 2 As shown, the main handle 121 is provided with a switch 1211. The switch 1211 is a button switch, which controls the working state of the circular saw 100, i.e. turning on or turning off the circular saw 100.

[0060] The driving mechanism 130 is arranged on the upper side of the base 110, at one side of the main handle 121, and drives the circular saw blade 200 to rotate around the first axis A to perform cutting operation. The driving mechanism 130 can be an electric motor. The connection between the electric motor and the circular saw blade 200 can be direct connection, or can be connected through other transmission structures, such as gear transmission structure or belt transmission structure, etc., which is not limited here. It can be understood that the driving mechanism 130 is electrically connected with the switch 1211, and the switch 1211 can control the start and stop of the driving mechanism 130, thereby controlling the rotation or stop of the circular saw blade 200, to realize the control of the working state of the circular saw 100. Of course, the circular saw 100 can also include a control mechanism, such as a control circuit board assembly, and the switch 1211 and the driving mechanism 130 are respectively electrically connected with the control mechanism to realize the control of the whole machine.

[0061] The battery pack 140 cooperates with the battery pack interface 123 arranged on the rear side of the handle assembly 120, and the battery pack 140 is detachably combined to the circular saw 100 based on the battery pack interface 123, and cooperates with the corresponding power supply circuit to supply power to the circular saw 100 to drive the driving mechanism 130 to operate. It should be understood by those skilled in the art that the direct current power supply is not limited to the scenario of using the battery pack 140, which can be a built-in rechargeable battery pack or a standard battery pack. It can be understood that the circular saw 100 can also be powered by mains power, alternating current power supply, cooperating with the corresponding rectification, filtering and voltage regulation circuit, to realize the power supply to the corresponding components in the machine. The battery pack 140 is described in the application for specific power supply, but it cannot be regarded as a limitation of the application. Alternatively, the nominal voltage of the battery pack 140 can be 24V. Alternatively, the nominal voltage of the battery pack 140 can also be other values, which is not limited in the application.

[0062] As shown in Figure 3 The base 110 includes a window portion 111, which is specifically a hollow portion on the base 110. The circular saw blade 200 can be arranged in the window portion 111 of the base 110 and protrude downward from the window portion 111, so that part of the circular saw blade 200 is located above the base 110 and part of the circular saw blade 200 is located below the base 110. The circular saw blade 200 is arranged along the front-rear direction in Figure 1 The part of the circular saw blade 200 protruding from the window portion 111 cuts into the cutting material to perform cutting processing. The circular saw blade 200 is located on the other side of the main handle 121 opposite to the driving mechanism 130.

[0063] The fixed guard 300 covers part of the outer side of the circumference of the circular saw blade 200. The fixed guard 300 can protect the circular saw blade 200 and block the cutting chips generated when the circular saw blade 200 cuts to avoid the chips flying. As shown in Figure 4As shown, the fixed shroud 300 includes a main shroud 310 and a lower end 320, the main shroud 310 is fixedly connected with the lower end 320, the main shroud 310 includes a portion located at the upper side of the circular saw blade 200 and the rear part in the cutting direction, and the lower end 320 is located at the front part in the cutting direction. As shown Figure 4 As shown, the straight line P is the boundary line between the main shroud 310 and the lower end 320 of the fixed shroud 300, the lower end 320 is located at the front part of the circular saw blade 200 in the front-rear direction, the main shroud 310 includes a portion located at the rear part of the circular saw blade 200 in the front-rear direction, and a portion located at the upper part of the circular saw blade 200 in the up-down direction. Wherein, the application does not limit the fixed connection mode of the main shroud 310 and the lower end 320, any mode that can firmly connect the main shroud 310 and the lower end 320 is available.

[0064] The movable shroud 400 rotates relative to the fixed shroud 300 and can cover part of the outer side of the circular saw blade 200. When the circular saw 100 is not in use, the movable shroud 400 is located at the lower side of the base 110 and covers at least part of the circular saw blade 200 protruding below the window part 111, avoiding the exposed circular saw blade 200 from causing harm to the operator. When the circular saw 100 needs to be cut, the movable shroud 400 will be pushed away and rotated with the movement of the circular saw blade 200 during cutting, and based on the different cutting depths of the circular saw blade 200 and the cutting material, the angle of the movable shroud 400 pushed away and rotated is also different. After the circular saw 100 stops cutting and moves away from the cutting material, the movable shroud 400 will automatically reset to the initial protection state shown in the figure. Wherein, the material of the movable shroud 400 is plastic material.

[0065] The chip collecting assembly 500 is used to guide and collect the cutting chips generated when the circular saw 100 cuts metal, as shown in Figure 3 As shown, the chip collecting assembly 500 includes a chip guide pipe 510 and a dust collecting box 520, the chip guide pipe 510 is in communication with the dust collecting box 520, the chip guide pipe 510 is used to guide the cutting chips, and the cutting chips are accumulated in the dust collecting box 520 after passing through the chip guide pipe 510. Wherein, the chip guide pipe 510 is arranged inside the fixed shroud 300, specifically inside the main shroud 310. The chip guide pipe 510 is a metal chip guide pipe, which is different from the material of the fixed shroud 300, and the metal chip guide pipe 510 will be used instead of the chip guide pipe 510 in the following. The cutting chips generated during cutting metal have a certain temperature, by using the metal chip guide pipe 510, on the one hand, it can avoid damage to the metal chip guide pipe 510 caused by high-temperature cutting chips entering the metal chip guide pipe 510, thereby ensuring the service life of the metal chip guide pipe 510; on the other hand, the heat dissipation performance of metal material is good, and the cutting chips can be cooled by collision during the guiding process, so that the cutting chips entering the metal chip guide pipe 510 can be cooled, the temperature of the cutting chips is reduced, and the cutting chips become low-temperature cutting chips, which are not easy to adhere to the metal chip guide pipe 510.

[0066] In some embodiments, as shown in Figure 5 A gear box 210 is arranged between the driving mechanism 130 and the circular saw blade 200, and the driving mechanism 130 drives the circular saw blade 200 to rotate based on the gear box 210. The circular saw 100 comprises a housing assembly 101, the driving mechanism 130 is arranged inside the housing assembly 101, the gear box 210 comprises a part exposed to the housing assembly 101, the housing assembly 101 comprises a part surrounding three sides of the gear box 210, and there is a gap between the housing assembly 101 and the gear box 210. As shown in Figure 5 A sealing member 211 is arranged between the gear box 210 and the housing assembly 101, specifically between the gear box 210 and the housing assembly 101 where the driving mechanism 130 is arranged. Optionally, the sealing member 211 can be made of silicone. Optionally, the sealing member 211 can also be made of any material that can seal the gap, which is not limited in the present application.

[0067] The sealing member 211 comprises a first sealing part 2111 and a second sealing part 2112, which are integrally formed. The first sealing part 2111 is substantially along the front-rear direction, and is used to seal the first side of the housing assembly 101 surrounding the gear box 210; the second sealing part 2112 is located on both sides of the first sealing part 2111, and is used to seal the corresponding two sides of the housing assembly 101 surrounding the gear box 210. The specific shape of the first sealing part 2111 and the second sealing part 2112 is not limited in the present application, and the first sealing part 2111 and the second sealing part 2112 are arranged based on the specific shape of the gap between the housing assembly 101 and the gear box 210 to fill the gap.

[0068] Therefore, during the operation of the circular saw 100, based on the sealing member 211, the cutting chips generated by cutting cannot pass through the gap between the gear box 210 and the housing assembly 101, and cannot reach the driving mechanism 130 inside the housing assembly 101, avoiding the disadvantage that the cutting chips rub against the driving mechanism 130, which may damage the driving mechanism 130 and affect the service life and user experience of the circular saw 100. In addition, the sealing member 211 can be conveniently inserted into the gap between the gear box 210 and the housing assembly 101, and is easy to assemble.

[0069] In some embodiments, as shown in Figure 2 and Figure 5As shown, in the front-rear direction, the auxiliary handle 122 is arranged at the front side of the driving mechanism 130 and connected to the housing assembly 101 where the driving mechanism 130 is located, that is, the auxiliary handle 122 is located at the front side of the main handle 121 as a whole. In the left-right direction, the auxiliary handle 122 is arranged at one side of the main handle 121. Therefore, when the user holds the main handle 121 with one hand and holds the auxiliary handle 122 with the other hand to perform the cutting operation, the hand holding the auxiliary handle 122 will not block the user's line of sight, so that the user's viewing angle for observing the specific cutting condition of the circular saw blade 200 during cutting will not be blocked, thereby ensuring the accuracy during cutting and improving the user's experience.

[0070] In some embodiments, as Figure 7 shown, the auxiliary handle 122 can be connected to the housing assembly 101 through a hexagonal nut 1221, thereby facilitating the disassembly and installation of the auxiliary handle 122. The auxiliary handle 122 further includes a recess 1222 for placing a hexagonal wrench matched with the hexagonal nut 1221, so that the user can directly take the hexagonal wrench from the circular saw 100 when disassembling or installing the auxiliary handle 122, without the need for additional preparation, thereby improving the convenience of disassembly or installation for the user. As Figure 7 shown, the housing assembly 101 near the auxiliary handle 122 is further provided with a fixing groove 1011 matched with the hexagonal wrench. When the hexagonal wrench is placed on the auxiliary handle 122, the hexagonal wrench is placed on the recess 1222, and the end portion thereof is inserted into the fixing groove 1011, so that the hexagonal wrench is stably installed on the auxiliary handle 122, and the hexagonal wrench will not fall off from the circular saw 100 when the circular saw 100 is used for cutting, thereby ensuring the safety of the circular saw 100 during use. In order to facilitate the user to easily take the hexagonal wrench, the hexagonal wrench includes a portion protruding from the recess 1222 and located at the front side of the auxiliary handle 122 when the hexagonal wrench is installed on the recess 1222. The user can easily take out the hexagonal wrench by pulling the protruding front side portion of the hexagonal wrench outward. In addition, Figure 7 The setting position of the fixing groove 1011 is only an example, and the fixing groove 1011 can be arranged at any position facilitating the cooperation and fixation with the hexagonal wrench, which is not limited in the present application. In addition, the auxiliary handle 122 can be connected to the housing assembly 101 through other forms of assemblies, and the disassembly or installation tool arranged on the auxiliary handle 122 can be changed accordingly, which is not limited in the present application.

[0071] In some embodiments, the specific arrangement of the fixed guard 300 has certain influence on the dust collection efficiency of the circular saw 100, and the fixed guard 300 is described in detail as follows.

[0072] As Figure 4 and Figure 8As shown, the main body cover 310 of the fixed cover 300 is fixedly connected to the lower end 320. The fixed cover 300 is made of plastic, the main body cover 310 is opaque, and the lower end 320 is transparent. This allows the user to clearly see the cutting process when the circular saw blade 200 is cutting within the fixed cover 300, and also ensures the correctness of the cutting position based on the transparent lower end 320.

[0073] In some embodiments, since the main body cover 310 is opaque and the lower end portion 320 is transparent, the main body cover 310 and the lower end portion 320 are formed separately and then fixedly connected together. For example... Figure 8 As shown, both the main body cover 310 and the lower end 320 include outwardly extending portions with holes, so that the outer extensions of the main body cover 310 and the lower end 320 can be fixedly connected based on screws 311.

[0074] A limiting mechanism 330 is also provided at the connection between the main body cover 310 and the lower end 320. The limiting mechanism 300 includes two limiting mechanisms: a first limiting mechanism 331 and a second limiting mechanism 332. The first limiting mechanism 331 is parallel to the connection between the main body cover 310 and the lower end 320, and the second limiting mechanism 332 intersects with the connection between the main body cover 310 and the lower end 320. The first limiting mechanism 331 is longer and narrower, while the second limiting mechanism 332 is shorter and wider. Optionally, the first limiting mechanism 331 and the second limiting mechanism 332 are in contact. Optionally, the first limiting mechanism 331 and the second limiting mechanism 332 can be... Figure 9 The non-contact shown is not a limitation of this application.

[0075] During the cutting process of the circular saw 100, the rotating wind generated by the rotation of the circular saw blade 200 blows metal chips upwards, causing them to continuously fall onto the lower end 320. The outer side of the lower end 320 is fixedly connected to the outer side of the main body shield 310 by screws 311. However, the connection between the lower end 320 and the main body shield 310 may flip outwards due to repeated impacts from the metal chips, causing deformation of the lower end 320 and making it difficult for the circular saw 100 to continue working. By setting the aforementioned first limiting mechanism 331 and second limiting mechanism 332, the lower end 320 can be prevented from flipping outwards, ensuring a tight connection between the lower end 320 and the main body shield 310, thereby improving the stability of the circular saw 100 during operation.

[0076] In some embodiments, such as Figure 9 and Figure 12As shown, the bottom end 323 of the lower end 320 of the fixed shroud 300 includes an upward recess, so that the bottom end 323 is kept a distance from the base 110. As shown Figure 13 As shown, the window portion 111 on the base 110 extends to the edge of the fixed shroud 300, specifically, the window portion 111 extends to the edge of the bottom end 323, so that the area of the window portion 111 is large. Thus, when the circular saw 100 is cutting, the probability that the cuttings fall out of the base 110 from the window portion 111 is large, and the cuttings can splash outwards from the recess of the bottom end 323 between the base 110 and the lower end 320, thereby reducing the probability that the cuttings accumulate between the base 110 and the lower end 320, reducing the probability that the lower end 320 is melted by the accumulated cuttings at high temperature, further improving the reliability of the lower end 320, ensuring the effective working life of the circular saw 100, and improving the user's experience. In addition, reducing the probability of cuttings accumulating between the base 110 and the lower end 320 also reduces the probability of the movable shroud 400 located below the base 110 being melted or deformed by high temperature, prolonging the service life of the movable shroud 400.

[0077] As shown Figure 8 As shown, the lower end 320 of the fixed shroud 300 includes at least a first section 321 and a second section 322, both of which are arranged in the radial direction of the circular saw blade 200, where the radial direction of the circular saw blade 200 is specifically the extension direction of the plane in which the circular saw blade 200 is located, and the slopes of the first section 321 and the second section 322 are different. The first section 321 and the second section 322 are specifically Figure 8 As shown, the section corresponding to the center line of the lower end 320, where the center line is specifically the center line of the lower end 320 in the left-right direction. The following of the present application is taken as an example to be specifically described, that is, the center line of the lower end 320 and the planes on the left and right sides thereof are in the same plane, that is Figure 9 and Figure 10 The section of the side view of the lower end 320 can represent the first section 321 and the second section 322 corresponding to the center line. In addition, in some embodiments, the center line can not be in the same plane as the planes on the left and right sides thereof, which is not specifically described herein. In addition, the lower end 320 can also include three sections, four sections, or other arbitrary number of sections greater than two sections, which is not limited by the present application, and the slopes of the plurality of sections are all different, which is not described again.

[0078] In some embodiments, the first section 321 is a first circular arc, and the second section 322 is a second circular arc, i.e., the lower end portion 320 is composed of at least two circular arcs. At this time, the slope of the tangent plane where the two endpoints of the first circular arc are located is the slope of the first section 321, and the slope of the tangent plane where the two endpoints of the second circular arc are located is the slope of the second section 322. Figure 10 In some embodiments, the first section 321 and the second section 322 in the first circular arc and the second circular arc are both circular arcs, and the slope of the first circular arc is k1 shown in the following formula (1), and the slope of the second circular arc is k2 shown in the following formula (2). Figure 10 In some embodiments, the first section 321 and the second section 322 in the first circular arc and the second circular arc are both circular arcs, and the slope of the first circular arc is k1 shown in the following formula (1), and the slope of the second circular arc is k2 shown in the following formula (2). Figure 10 In some embodiments, the first section 321 and the second section 322 in the first circular arc and the second circular arc are both circular arcs, and the slope of the first circular arc is k1 shown in the following formula (1), and the slope of the second circular arc is k2 shown in the following formula (2). Wherein, the radius of the first circular arc and the second circular arc can be the same or different, and the center position of the first circular arc and the second circular arc can be the same or different, which is not limited by the present application. Then, the first circular arc and the second circular arc include four cases, the radius of the first circular arc and the second circular arc is the same and the center position is the same, the radius of the first circular arc and the second circular arc is the same and the center position is different, the radius of the first circular arc and the second circular arc is different and the center position is the same, and the radius of the first circular arc and the second circular arc is different and the center position is different.

[0079] In some embodiments, the first section 321 or the second section 322 is a straight line section, i.e., one of the first section 321 and the second section 322 is a straight line section, and the other is a circular arc section, and the lower end portion 320 has at least one circular arc section in the radial direction of the circular saw blade 200. At this time, the slope of the straight line section in the first section 321 or the second section 322 is the slope of the corresponding straight line, and the slope of the circular arc section is the slope of the tangent plane where the two endpoints are located.

[0080] In some embodiments, the first section 321 and the second section 322 in the first circular arc and the second circular arc are both circular arc sections. At this time, the first section 321 is a first circular arc section 321, and the second section 322 is a second circular arc section 322. The radius of the first circular arc section 321 and the second circular arc section 322 can be the same or different, and the center position of the first circular arc section 321 and the second circular arc section 322 can be the same or different.

[0081] In some embodiments, at least one of the centers of the first circular arc corresponding to the first section 321 and the second circular arc corresponding to the second section 322 is located above the center of the circular saw blade 200, i.e., at least one of the centers of the first circular arc section 321 and the second circular arc section 322 is located above the center of the circular saw blade 200. Specifically, when the center of the first circular arc section 321 is located above the center of the circular saw blade 200, the center of the second circular arc section 322 can be located at any position on the left side of the center of the circular saw blade 200. Similarly, when the center of the second circular arc section 322 is located above the center of the circular saw blade 200, the center of the first circular arc section 321 can be located at any position on the left side of the center of the circular saw blade 200.

[0082] In some embodiments, when the center of the first arc segment 321 is located above the center of the circular saw blade 200, and the center of the second arc segment 322 is located at any position to the left of the center of the circular saw blade 200, the line connecting the center of the first arc segment 321 to any point on the first arc segment 321 is located above the center of the circular saw blade 200, and the line connecting the center of the second arc segment 322 to any point on the second arc segment 322 includes the portion located above the center of the circular saw blade 200. Similarly, when the center of the second arc segment 322 is located above the center of the circular saw blade 200, and the center of the first arc segment 321 is located at any position to the left of the center of the circular saw blade 200, the situation is the same as described above, and will not be repeated here. When the circular saw 100 cuts, the chips will splash onto the first arc segment 321 or the second arc segment 322. The positions of the two arc centers and the lines connecting the two arcs to their respective centers relative to the center of the circular saw blade 200 are designed to maximize the angle of incidence and reflection of the chips splashing onto the first arc segment 321 or the second arc segment 322. This ensures that the chips enter the metal chip guide tube 510 as much as possible for collection. The angle of incidence and the angle of reflection are the same.

[0083] This application uses the example that the centers of both arc segments are located above the center of the circular saw blade 200, and that the lines connecting the centers of the two arc segments to any point on them are also located above the center of the circular saw blade 200, for specific illustration. Figure 11 As shown, the center of the circular saw blade 200 is the saw blade center 201, the center of the first arc segment 321 is the first center 3211, and the center of the second arc segment 322 is the second center 3221. The first center 3211 and the second center 3221 are both located above the saw blade center 201, and the line connecting the first center 3211 to any point on the first arc segment 321, as well as the line connecting the second center 3221 to any point on the second arc segment 322, are both located above the saw blade center 201. Figure 11 In the middle, the circular saw blade 200 cuts at the corresponding cutting point C, and Figure 11 An example is given of the splash trajectory of the chip at cutting point C onto either the first arc segment 321 or the second arc segment 322. When the chip splashes onto the first arc segment 321, from... Figure 11 The splash trajectory shows that the incident angle of the chip is angle E, and the reflection angle is angle E'. Angles E and E' are equal and both are relatively large, allowing the chip to enter the metal chip guide tube 510 based on these large incident and reflection angles. When the chip splashes onto the second arc segment 322, from... Figure 11 As can be seen from the splash trajectory, the incident angle of the chip is angle D, and the reflection angle is angle D'. The angles of angles D and D' are equal and both are relatively large, so the chip can enter the metal chip guide tube 510 based on the large incident angle and reflection angle.

[0084] Therefore, this application sets the lower end 320 of the fixed cover 300 to include at least one arc structure, such that the center of at least one arc on the lower end 320 is located above the center of the circular saw blade 200, the line connecting the center of at least one arc to any point on the arc is located above the center of the circular saw blade 200, and the centers of other arcs are located to the left of the center of the circular saw blade 200. As a result, the incident angle and reflection angle of the chips when they fall onto the lower end 320 are larger, and they can enter the metal chip guide tube 510 as much as possible, thereby improving the dust collection efficiency of the circular saw 100.

[0085] In some embodiments, such as Figure 11 As shown, the minimum distance between the top tooth of the circular saw blade 200 and its lower end 320 is greater than or equal to 11 mm and less than or equal to 16 mm. Optionally, the minimum distance between the top tooth of the circular saw blade 200 and its lower end 320 can be 12.3 mm. Optionally, the minimum distance between the top tooth of the circular saw blade 200 and its lower end 320 can be 13 mm. Optionally, the minimum distance between the top tooth of the circular saw blade 200 and its lower end 320 can be 14.5 mm. Optionally, the minimum distance between the top tooth of the circular saw blade 200 and its lower end 320 can be 15 mm. The top tooth of the circular saw blade 200 is the edge of the saw blade, and the distance from the edge of the saw blade to the lower end 320 is specifically the distance along the radial direction of the saw blade.

[0086] By setting the minimum distance between the top tooth of the circular saw blade 200 and the lower end 320 within a reasonable range, the space between the circular saw blade 200 and the lower end 320 is appropriate. This avoids the disadvantages of the lower end 320 being too far from the front of the circular saw blade 200, which would hinder the effective blowing of the rotating airflow from the circular saw blade 200 onto the chips and prevent the chips from being efficiently blown into the dust collection box 520, thus improving the dust collection efficiency of the circular saw 100. At the same time, setting the minimum distance between the top tooth of the circular saw blade 200 and the lower end 320 within a reasonable range avoids the disadvantages of the lower end 320 being too close to the front of the circular saw blade 200, which would cause the chips to collide with each other in the lower end 320 and deviate from their original track, ensuring that the chips can be blown into the metal chip guide tube 510 along the preset track.

[0087] In some embodiments, the specific configuration of the chip collection assembly 500 also has a certain impact on the dust collection efficiency of the circular saw 100. The chip collection assembly 500 is described in detail below.

[0088] The chip collecting assembly 500 comprises a metal chip guide pipe 510 and a dust collecting box 520. The metal chip guide pipe 510 surrounds the outer side of part of the circumference of the circular saw blade 200, and comprises a chip guide cavity 513 for guiding the cuttings, and an inlet 511 and an outlet 512 in communication with the chip guide cavity 513. The inlet 511 is used for receiving the cuttings reflected based on the lower end portion 320, so that the cuttings enter the chip guide cavity 513 and are guided to the outlet 512 based on the chip guide cavity 513. The inlet 511 is arranged near the connection between the main body shroud 310 and the lower end portion 320, so as to receive the cuttings reflected from the lower end portion 320. The dust collecting box 520 is in communication with the chip guide cavity 513, and collects the cuttings discharged from the outlet 512 of the metal chip guide pipe 510. When the cuttings accumulate to a certain degree, the dust collecting box 520 can be opened to pour out the cuttings.

[0089] The dust collecting box 520 comprises a metal heat dissipation portion 521 and a non-metal anti-scald portion 522. The metal heat dissipation portion 521 is arranged inside the non-metal anti-scald portion 522 as an inner wall of the dust collecting box 520. The metal heat dissipation portion 521 can be arranged at the bottom and the side of the dust collecting box 520, or the metal heat dissipation portion 521 is arranged on the inner wall of the dust collecting box 520. The metal heat dissipation portion 521 surrounds to form a dust collecting cavity for containing the cuttings guided by the metal chip guide pipe 510. The metal heat dissipation portion 521 is made of metal, has good heat dissipation performance, can prevent the cuttings at high temperature from melting the dust collecting box 520, and is also beneficial to heat dissipation of the cuttings. The non-metal anti-scald portion 522 is arranged outside the dust collecting box 520 to form an outer wall of the dust collecting box 520, so that heat insulation can be achieved to prevent the dust collecting box 520 from being scalded.

[0090] As shown in Figure 3 , the non-metal anti-scald portion 522 can be integrally formed with the main body shroud 310 of the fixed shroud 300 through injection molding or other processes, so as to reduce the number of parts and improve the assembly speed of the circular saw 100. Of course, the metal heat dissipation portion 521 of the dust collecting box 520 and the metal chip guide pipe 510 in the embodiment can be integrally formed, that is, they are a whole metal piece integrally formed through processes such as sheet metal bending and stamping. Alternatively, the metal heat dissipation portion 521 and the metal chip guide pipe 510 can be separately formed and then assembled, which is not limited.

[0091] As shown in Figure 3 , the dust collecting box 520 further comprises a box cover 523. The box cover 523 is pivotally connected with the dust collecting box 520, so that the box cover 523 can be opened to pour out the cuttings in the dust collecting box 520. Figure 3As shown, the metal heat dissipation part 521 covers the inner wall of the dust collecting box 520, for example, the metal heat dissipation part 521 also includes a metal sheet 5231 arranged on the inner side of the box cover 523, wherein the box cover 523 is of a non-metal material, and specifically can be of the same material as the non-metal anti-scald part 522 and the main body shroud 310. The metal sheet 5231 can block the metal chips in the dust collecting box 520 and the box cover 523, so as to prevent the metal chips from contacting the box cover 523 of the non-metal material and protect the box cover 523 from being damaged. Of course, as an alternative embodiment, the dust collecting box 520 can also be a separate component, which is assembled and connected with the fixed shroud 300 by screws or other locking members after being processed, and only needs to satisfy the communication between the inside and the chip guiding cavity 513.

[0092] In the present application, as Figure 1 shown, the box cover 523 is arranged on the right side of the dust collecting box 520, that is, the side of the dust collecting box 520 away from the handle assembly 120. In combination with Figure 1 and Figure 3 , the right side of the dust collecting box 520 is provided with a dust outlet 524, and the box cover 523 is closed at the dust outlet 524 to close or open the dust outlet 524. Since the box cover 523 is arranged on the right side of the dust collecting box 520 and the inner side of the box cover 523 is provided with the metal sheet 5231, the metal heat dissipation part 521 of the dust collecting box 520 covers the left side wall, the right side wall, the front side wall, the rear side wall and the bottom wall of the dust collecting box, and the metal heat dissipation part 521 forms a cylindrical structure, so as to accommodate the metal chips. The top of the cylindrical structure is open, and the front side wall of the metal heat dissipation part 521 extends to the metal chip guiding pipe 510 of the fixed shroud 300, so that the chips in the metal chip guiding pipe 510 enter the cylindrical structure from the open part.

[0093] As shown in Figure 3 , the box cover 523 is connected to the dust collecting box 520 by pivoting, and the box cover 523 rotates around an axis, which is arranged in the up-down direction. When the box cover 523 is pivoted to the dust collecting box 520, in order to lock the box cover 523 on the dust collecting box 520 when the box cover 523 is closed, a corresponding locking structure can also be used to achieve locking, such as a buckle connection structure. In addition, the box cover 523 can also be connected to the dust collecting box 520 by clamping, which is not limited in the present application.

[0094] In some embodiments, as Figure 8 shown, a visible part 525 is further arranged on the upper side of the dust collecting box 520, and specifically arranged on the upper side of the non-metal anti-scald part 522 in the dust collecting box 520. The visible part 525 is a transparent component, and the metal heat dissipation part 521 of the dust collecting box 520 is a cylindrical structure with an open top, so that the user can directly see the dust collecting condition in the dust collecting box 520 based on the visible part 525, and can clean the dust collecting box 520 in time.

[0095] As the chips enter the dust collection box 520 from the metal chip guide tube 510, they will not fall to the upper part of the dust collection box 520, thus preventing the chips from contacting the viewing part 525 and avoiding scratching it. This ensures the user's ability to observe the dust collection box 520. Furthermore, during normal use of the circular saw 100, the user can observe the interior of the dust collection box 520 at any time thanks to the viewing part 525 located on the upper side. Additionally, during use, light will penetrate the upper viewing part 525 to reach the bottom of the dust collection box 520, further facilitating the user's observation of its interior.

[0096] Optionally, the visible part 525 can be heat-resistant glass, transparent plastic, or other transparent heat-resistant materials, so that a certain amount of chips are collected in the dust collection box 520, thus ensuring the service life of the visible part 525 when the temperature is high. Of course, the non-metallic anti-scalding part 522 can also be made entirely of transparent material, which is not limited in this application.

[0097] In some embodiments, the ratio of the area of ​​the inlet 511 of the metal chip guide 510 to the cross-sectional area of ​​the metal chip guide 510 located above the circular saw blade 200 is greater than or equal to 2. Specifically, the cross-sectional area of ​​the metal chip guide 510 located above the circular saw blade 200 refers to the left-right cross-sectional area of ​​the metal chip guide 510 corresponding to the area directly above the rotation center of the circular saw blade 200, that is, the left-right cross-sectional area of ​​the chip guide cavity 513 located directly above the rotation center of the circular saw blade 200 (i.e., the center of the circular saw blade 200), specifically as follows: Figure 4 The cross-sectional area of ​​the metal chip guide tube 510 in the left-right direction corresponds to the straight line M extending vertically and passing through the rotation center of the circular saw blade 200. Optionally, the ratio of the area of ​​the inlet 511 to the cross-sectional area of ​​the metal chip guide tube 510 located above the circular saw blade 200 can be 2.25. Optionally, the ratio of the area of ​​the inlet 511 to the cross-sectional area of ​​the metal chip guide tube 510 located above the circular saw blade 200 can be 2.5. The ratio of the area of ​​the inlet 511 to the cross-sectional area of ​​the metal chip guide tube 510 located above the circular saw blade 200 can be 2.8. The ratio of the area of ​​the inlet 511 to the cross-sectional area of ​​the metal chip guide tube 510 located above the circular saw blade 200 can be 3. Furthermore, as... Figure 4 As shown, the area of ​​the inlet 511 is larger than the cross-sectional area of ​​any point on the chip guide cavity 513.

[0098] In some embodiments, the area of ​​the inlet 511 of the metal chip guide 510 is greater than or equal to 600 mm². 2 Optionally, the area of ​​entrance 511 is 604 mm². 2 Optionally, the area of ​​entrance 511 is 610 mm². 2 Optionally, the area of ​​entrance 511 is 623 mm².2 Optionally, the area of the inlet 511 is 645mm 2 Optionally, the area of the inlet 511 is 650mm 2 .

[0099] Based on the area range of the inlet 511 of the metal chip guide pipe 510, and the ratio range of the area of the inlet 511 to the cross-sectional area of the chip guide cavity 513 of the metal chip guide pipe 510 at the upper part of the circular saw blade 200, it can be seen that the area of the inlet 511 of the metal chip guide pipe 510 in the present application is larger than the cross-sectional area of the chip guide cavity 513 at any position, and is much larger than the cross-sectional area of the chip guide cavity 513 at the position directly above the center of rotation of the circular saw blade 200. By setting the inlet 511 with a larger area, the chips can easily enter the metal chip guide pipe 510, and when the number of chips is large, they can also easily enter the metal chip guide pipe 510, thereby improving the dust collection efficiency of the circular saw 100.

[0100] In some embodiments, as shown in Figure 3 and Figure 4 , the bottom of the inlet 511 of the metal chip guide pipe 510 includes a vertical face 5111 extending along the up-down direction, so that when the chips are reflected by the lower end 320 to the inlet 511, they have a probability of being reflected and hitting the vertical face 5111, and then being reflected into the metal chip guide pipe 510. By setting the vertical face 5111, the probability that the chips cannot enter the metal chip guide pipe 510 when the reflection angle of the lower end 320 is not appropriate is avoided, further improving the dust collection efficiency of the circular saw 100.

[0101] Therefore, based on the large area of the inlet 511 and the specific structure including the vertical face 5111 set in the present application, combined with the specific structure of the lower end 320 including at least one circular arc, the centers of the circular arcs on the lower end 320 are all located above the center of the circular saw blade 200, the line connecting the center of the circular arc and any point on the circular arc is located above the center of the circular saw blade 200, and the minimum distance between the lower end 320 and the circular saw blade 200, the dust collection efficiency of the circular saw 100 is comprehensively improved, so that the dust collection efficiency of the circular saw 100 is greater than or equal to 70%. Optionally, the dust collection efficiency of the circular saw 100 is 73%. Optionally, the dust collection efficiency of the circular saw 100 is 75%.

[0102] In some embodiments, in the radial direction of the circular saw blade 200, the distance between the bottom of the inlet 511 of the metal chip guide pipe 510 and the center of the circular saw blade 200 is greater than the radius of the circular saw blade 200. As shown in Figure 3As shown, the metal chip guide tube 510 has outwardly extending extensions 5112 on both sides of the inlet 511. The distance between the extensions 5112 and the center of the circular saw blade 200 is greater than the radius of the circular saw blade 200. Optionally, the radius of the circular saw blade 200 is greater than or equal to 68 mm and less than or equal to 75 mm. Optionally, the radius of the circular saw blade 200 is 70 mm. Optionally, the radius of the circular saw blade 200 is 73 mm. Optionally, the distance between the extensions 5112 and the center of the circular saw blade 200 is greater than 75 mm and less than or equal to 79 mm. Optionally, the distance between the extensions 5112 and the center of the circular saw blade 200 is 76 mm. Optionally, the distance between the extensions 5112 and the center of the circular saw blade 200 is 76.8 mm. Optionally, the distance between the extensions 5112 and the center of the circular saw blade 200 is 78 mm. Optionally, the distance between the extension 5112 and the center of the circular saw blade 200 is 78.5 mm. In addition, the radius of the circular saw blade 200 can be other values, and the distance between the extension 5112 and the center of the circular saw blade 200 can be other distances greater than the radius of the circular saw blade 200. This application does not limit these values.

[0103] In some embodiments, the outer surface area of ​​the metal chip guide tube 510 is S1, and the surface area of ​​the fixed cover 300 surrounding the metal chip guide tube 510 is S2, with the ratio of S1 to S2 being greater than 1. That is, the outer surface area S1 of the metal chip guide tube 510 is larger than the surface area S2 of the fixed cover 300 surrounding it, and the fixed cover 300 does not completely surround the metal chip guide tube 510. Specifically, the outer surface area S1 of the metal chip guide tube 510 refers to the area around the metal chip guide tube 510, and the portion of the fixed cover 300 surrounding the metal chip guide tube 510 is specifically the main cover 310. Optionally, the ratio of S1 to S2 is greater than or equal to 1.2. Optionally, the ratio of S1 to S2 is greater than or equal to 1.35. Optionally, the ratio of S1 to S2 is greater than or equal to 1.4. Optionally, the ratio of S1 to S2 is greater than or equal to 1.5.

[0104] In some embodiments, such as Figure 14 As shown, the fixed cover 300 does not completely enclose the metal chip guide tube 510 at its lower side. After removing the circular saw blade 200 or the movable cover 400, the bottom of the metal chip guide tube 510 can be seen from the lower surface of the base 110 along the window 111 of the base 110 towards the upper surface of the base 110. That is, the lower side of the metal chip guide tube 510 includes a portion exposed to the air. After the chips are reflected into the metal chip guide tube 510 via the lower end 320, most of the chip's trajectory includes falling to the lower side of the metal chip guide tube 510. The portion of the lower side of the metal chip guide tube 510 exposed to the air corresponds to the normal chip falling position. Therefore, after the chips fall, because this part is exposed to the air, the heat of the chips can be directly transferred to the air based on the metal chip guide tube 510, helping the chips to dissipate heat and cool down more effectively.

[0105] In some embodiments, the metal chip guide pipe 510 is fixed on the fixed shroud 300 by the support 301, at least part of the support 301 is arranged at both ends of the lower surface of the metal chip guide pipe 510, specifically, both ends of the lower surface of the metal chip guide pipe 510, so that the support 301 can support the metal chip guide pipe 510, so that the metal chip guide pipe 510 is fixed inside the fixed shroud 300. The support 301 at both ends is formed with a hollow portion, so that the lower side of the metal chip guide pipe 510 includes a portion exposed to air. Optionally, the support 301 is integrally formed with the fixed shroud 300, the support 301 is part of the fixed shroud 300, and the support 301 and the fixed shroud 300 are made of the same plastic material. Optionally, the support 301 and the fixed shroud 300 are formed separately, and the support 301 is fixedly connected to the fixed shroud 300. The support 301 can be made of the same plastic material as the fixed shroud 300, or the support 301 can be made of a metal different from the fixed shroud 300. In addition, the support 301 can also be made of other materials, which are not limited in the present application. When the support 301 is made of plastic, the hollow support 301 avoids the disadvantage that the metal chip guide pipe 510 is overheated and has a probability of melting the support 301.

[0106] In some embodiments, a plurality of rib positions 312 are arranged between the metal chip guide pipe 510 and the fixed shroud 300, so that there is a gap between the metal chip guide pipe 510 and the fixed shroud 300, and the metal chip guide pipe 510 and the fixed shroud 300 are not in direct contact. As shown in Figure 15 and Figure 16 As shown, the upper surface, the left surface and the right surface of the metal chip guide pipe 510 are in contact with the inner surface of the fixed shroud 300 through the interval arrangement of the rib positions 312, so that after the chips enter the metal chip guide pipe 510, the metal chip guide pipe 510 can dissipate heat based on the gap of the plurality of rib positions 312, effectively guaranteeing the heat dissipation performance of the metal chip guide pipe 510.

[0107] Optionally, the metal chip guide pipe 510 is integrally formed, so that the metal chip guide pipe 510 has good sealing performance, effectively avoiding the disadvantage that the chips leak from the metal chip guide pipe 510 and fall on the fixed shroud 300, causing the fixed shroud 300 to be deformed and melted. Optionally, the metal chip guide pipe 510 can also be welded by two half assemblies, and then assembled into the fixed shroud 300 as a whole. The welded metal chip guide pipe 510 also has good sealing performance, and can achieve the same technical effect as the integrally formed metal chip guide pipe 510.

[0108] In some embodiments, the thermal conductivity of the fixed shroud 300 is different from that of the metal chip guide pipe 510. Compared with the fixed shroud 300 made of plastic material, the metal chip guide pipe 510 made of metal material has higher thermal conductivity, so that the heat dissipation efficiency of the metal chip guide pipe 510 is better, and the metal chip guide pipe 510 can dissipate heat in time after the cutting chips enter the metal chip guide pipe 510. Optionally, the metal chip guide pipe 510 can be composed of SUS304 material, and the heat transfer coefficient of the metal chip guide pipe 510 is 15 W / (m2·K).

[0109] The present application sets the fixed shroud 300 not to completely wrap the metal chip guide pipe 510, and sets a plurality of rib positions 312 between the fixed shroud 300 and the metal chip guide pipe 510, which improves the heat dissipation effect of the metal chip guide pipe 510, reduces the risk of melting deformation of the fixed shroud 300, prolongs the service life of the fixed shroud 300, and prolongs the service life of the circular saw 100.

[0110] In some embodiments, the fixed shroud 300 is provided with a guide portion 340 near the inlet 511 of the metal chip guide pipe 510, and the guide portion 340 is used to guide the cutting chips blown up during cutting of the circular saw blade 200 to the inlet 511. The guide portion 340 is the extension portion 5112 described above, and the guide portion 340 will be described in detail below. As shown in FIG. 6, the guide portion 340 includes an extension portion 341, which extends from the bottom of the inlet 511 to the first opening end 410 of the movable shroud 400 during cutting of the circular saw 100. The extension portion 341 extends to the lower end of the inlet 511 of the metal chip guide pipe 510, and includes a portion protruding from the lower end of the inlet 511. The first opening end 410 of the movable shroud 400 is the end of the movable shroud 400 abutting on the cutting material during cutting of the circular saw 100. Figure 16

[0111] In some embodiments, the guide portion 340 is connected or formed with a support portion 342, and the support portion 342 is arranged on the lower side of the metal chip guide pipe 510 and connected with the fixed shroud 300, so that the support portion 342 can fix the metal chip guide pipe 510 and the fixed shroud 300 to support the metal chip guide pipe 510. In some embodiments, the fixed shroud 300 and the support portion 342 are integrally formed, and the support portion 342 is formed by extending inwardly on the fixed shroud 300, so that the support portion 342 is made of the same plastic material as the fixed shroud 300, and the metal chip guide pipe 510 can be directly arranged inside the fixed shroud 300 and supported by the fixed shroud 300. In some embodiments, the support member 301 includes a portion arranged near the inlet 511. Optionally, the support portion 342 and the support member 301 can be in contact. Optionally, the support portion 342 and the support member 301 can be two components with a certain interval. ​

[0112] In some embodiments, the guide portion 340 is integrally formed with the metal chip guide tube 510. The guide portion 340 is directly formed on the inner side of the inlet 511 of the metal chip guide tube 510 and connected thereto, thus being fixedly connected to the interior of the protective cover 300. In this case, the guide portion 340 is made of the same metal material as the metal chip guide tube 510. This prevents the guide portion 340 from melting or deforming when chips collide with it during cutting by the circular saw blade 200. In some embodiments, the guide portion 340 may also not be integrally formed with the metal chip guide tube 510; the guide portion 340 is formed separately and fixedly connected to the metal chip guide tube 510.

[0113] like Figure 8 As shown, the movable guard 400 includes a first side portion 420, a second side portion 430, and a bottom portion 440 connecting the first side portion 420 and the second side portion 430. The distance between the first side portion 420 and the second side portion 430 is appropriate, ensuring that when the circular saw blade 200 is assembled into the circular saw 100, the circular saw blade 200 will not contact the first side portion 420 or the second side portion 430. Simultaneously, the suitable distance between the first side portion 420 and the second side portion 430 prevents the circular saw 100 from having a large lateral dimension.

[0114] When the circular saw 100 is cutting, the movable guard 400 rotates clockwise based on the cutting depth of the circular saw blade 200. The rotation angle of the movable guard 400 is at its maximum when the cutting depth of the circular saw blade 200 is at its deepest. At this time, the guide portion 340 comes into contact with the first side portion 420 and the second side portion 430 of the movable guard 400, specifically as follows: Figure 8 The first end 421 of the first side portion 420 and the second end 431 of the second side portion 430 abut against the extension 341 of the movable cover 400.

[0115] like Figure 16 As shown, the guide portion 340 is generally flat, specifically the extension portion 341 included in the guide portion 340 is also basically flat. The guide portion 340 includes a slit 343 formed from its lower end to allow the circular saw blade 200 to enter the slit 343. The slit 343 is formed by the extension portions 341 on both sides, and the width of the slit 343 is greater than the thickness of the circular saw blade 200, ensuring that the circular saw blade 200 does not contact the side walls of the slit 343 during rotation. Simultaneously, the distance between the upper wall of the slit 343 and the center of the circular saw blade 200 in the radial direction is greater than the radius of the circular saw blade 200, ensuring that the circular saw blade 200 does not contact the two upper walls of the slit 343 during rotation. Therefore, the structure of the slit 343 ensures the safety of the circular saw blade 200 during rotation.

[0116] In some embodiments, the slit 343 can be as follows: Figure 16The illustrated rectangular slot. In some embodiments, the slot 343 can be a triangular slot. In some embodiments, the slot 343 can be an irregularly shaped slot. In addition, the slot 343 can also be any other arbitrary shape that the upper wall and the two side walls will not contact the circular saw blade 200, which is not limited in the present application.

[0117] By setting the guide part 340 protruding from the lower end of the inlet 511 on both sides of the metal chip guide pipe 510, the cutting chips are guided to enter the metal chip guide pipe 510 better, and to a certain extent, the cutting chips can be blocked from falling onto the movable guard 400, reducing the probability of melting or deformation of the movable guard 400.

[0118] In some embodiments, as shown in Figure 16 and Figure 17 As shown, the support part 342 is formed with a support part slot 3421, and the width of the support part slot 3421 is greater than the thickness of the circular saw blade 200, so that the circular saw blade 200 will not contact the two side walls of the support part slot 3421 during rotation. At the same time, the distance between the upper wall of the support part slot 3421 in the radial direction of the circular saw blade 200 and the center of the circular saw blade 200 is greater than the radius of the circular saw blade 200, so that the circular saw blade 200 will not contact the two upper walls of the support part slot 3421 during rotation. Further, the setting structure of the support part slot 3421 ensures the safety of the circular saw blade 200 during rotation. Wherein, the shape of the support part slot 3421 is not limited in the present application, and the support part slot 3421 can be any shape that meets the above conditions.

[0119] In addition, the upper wall and the two side walls of the support part slot 3421 are at a certain distance from the circular saw blade 200, but the distance is not too large, so that during the rotation of the circular saw blade 200, most of the cutting chips are blocked by the support part 342 and guided into the metal chip guide pipe 310 based on the guide part 340, only a small number of cutting chips fall to the lower side of the base 110 after passing through the support part slot 3421, reducing the probability of cutting chips falling onto the movable guard 400, reducing the probability of the movable guard 400 being melted or deformed by high temperature cutting chips, and prolonging the service life of the movable guard 400. In some embodiments, the distance between the upper wall of the support part slot 3421 and the center of the circular saw blade 200 is greater than 75 mm and less than or equal to 80 mm. Alternatively, the distance between the upper wall of the support part slot 3421 and the center of the circular saw blade 200 can be 76 mm. Alternatively, the distance between the upper wall of the support part slot 3421 and the center of the circular saw blade 200 can be 77.3 mm. Alternatively, the distance between the upper wall of the support part slot 3421 and the center of the circular saw blade 200 can be 78.5 mm.

[0120] In some embodiments, the distance between the bottom of the guiding portion 340 and the center of the circular saw blade 200 is greater than 75mm and less than or equal to 79mm, in particular, the distance between the bottom of the extending portion 341 of the guiding portion 340 and the center of the circular saw blade 200 is greater than 75mm and less than or equal to 79mm. In some embodiments, the present application takes the radius of the circular saw blade 200 as 75mm as an example for specific description, then the distance between the bottom of the supporting portion 342 and the center of the circular saw blade 200 is greater than or equal to 68mm and less than or equal to 74mm, in particular, the distance between the bottom 3422 of the supporting portion 342 and the center of the circular saw blade 200 is greater than or equal to 68mm and less than or equal to 74mm. Optionally, the distance between the bottom 3422 and the center of the circular saw blade 200 is 69.5mm. Optionally, the distance between the bottom 3422 and the center of the circular saw blade 200 is 70mm. Optionally, the distance between the bottom 3422 and the center of the circular saw blade 200 is 71.1mm. Optionally, the distance between the bottom 3422 and the center of the circular saw blade 200 is 73.5mm. Since the radius of the circular saw blade 200 is 75mm, the distance between the bottom 3422 of the supporting portion 342 and the center of the circular saw blade 200 is less than the radius of the circular saw blade 200, and the supporting portion 342 includes extending to the left and right sides of the circular saw blade 200. Thus, when the circular saw 100 is cutting, most of the cuttings can be blocked by the supporting portion 342 and enter the metal chip guide pipe 310 through the guidance of the extending portion 341. In addition, in some embodiments, the distance between the bottom of the extending portion 341 and the center of the circular saw blade 200 can also be less than or equal to the radius of the circular saw blade 200, which is not limited by the present application.

[0121] In some embodiments, as shown in Figure 1 and Figure 18 、 Figure 19 The circular saw 100 further includes a hook assembly 150. The circular saw 100 is a handheld power tool, and the user often needs to hang the circular saw 100 through the hook assembly 150 for later use after operating the circular saw 100 for a period of time, especially when the user is working at a high altitude. The hook assembly 150 can specifically include a connecting piece 151 and a hook piece 152, wherein the connecting piece 151 is used to connect the hook assembly 150 to the circular saw 100, and the hook piece 152 is used to hang the circular saw 100.

[0122] As shown in Figure 18 , the hook assembly 150 is arranged on the upper part of the front end of the handle assembly 120 of the circular saw 100, between the main handle 121 and the auxiliary handle 122. Thus, when the hook assembly 150 is used, it is more convenient to hang the circular saw 100, and other components on the circular saw 100 do not hinder the hanging. As shown in Figure 19As shown, the front end of the handle assembly 120 is provided with a fixing member 124, which cooperates with the connecting member 151 to enable the connecting member 151 to be fixedly connected to the circular saw 100. Alternatively, the fixing member 124 and the connecting member 151 are integrally formed. Alternatively, the fixing member 124 and the connecting member 151 are separately formed and fixedly connected. The fixing member 124 can be fixedly connected to the handle assembly 120 based on a screw or the like assembly. Alternatively, the fixing member 124 can be integrally formed with the handle assembly 120, which is not limited in the present application.

[0123] The hook member 152 can rotate relative to the connecting member 151, and the hook member 152 is rotationally connected to the connecting member 151. Specifically, as shown in Figure 19 As shown, the hook member 152 rotates about the axis N on which the connecting member 151 is located. The axis N is perpendicular to the rotation center of the circular saw blade 200. Alternatively, the hook member 152 can rotate by 90 degrees. Alternatively, the hook member 152 can rotate by 180 degrees. In addition, the hook member 152 can also rotate by other angles according to requirements, which is not limited in the present application.

[0124] As shown in Figure 18 As shown, the front end of the handle assembly 120 is further provided with a recess 125 matched with the hook member 152, for accommodating the hook member 152. As shown in Figure 1 As shown, when the hook member 152 is not used, the hook member 152 is located in the recess 125, and the hook member 152 is in a first position of being accommodated. At this time, when the user holds the main handle 121 and the auxiliary handle 122 with both hands respectively, the hook member 152 will not interfere with the user's hands, thereby facilitating the user's operation.

[0125] As shown in Figure 18 As shown, when the hook member 152 needs to be used, the hook member 152 can be rotated by 90 degrees from the Figure 1 As shown in Figure 18 When the hook member 152 is in the second position, the circular saw 100 can be hung at this time, and during the hanging process, the front end of the auxiliary handle 122 and the fixed guard 300 can abut against the hanging object, serving as two auxiliary hanging fulcrums, i.e., the front side of the circular saw 100 abuts against the hanging object, so that the hanging of the circular saw 100 is more stable.

[0126] As shown in Figure 19 As shown, when the hook member 152 needs to be used, the hook member 152 can be rotated by 90 degrees from the Figure 18 As shown in Figure 19 As shown, the hook member 152 is rotated by 180 degrees from the Figure 1 As shown in Figure 19The third position is shown. At this time, the circular saw 100 can be hung, and during the hanging process, the side end of the auxiliary handle 122 and the driving mechanism 130 can abut against the hanging object as two auxiliary hanging fulcrums, that is, the left side of the circular saw 100 abuts against the hanging object, so that the hanging of the circular saw 100 is more stable.

[0127] The basic principles, main features and advantages of the present application are shown and described above. Those skilled in the art should understand that the above-mentioned embodiments do not limit the present application in any form, and any technical solutions obtained by equivalent replacement or equivalent transformation fall within the protection scope of the present application.

Claims

1. A portable circular saw for cutting metal, comprising: a base having a lower surface side abutting against a cutting material, and a cutting machine body supported at least partially on an upper surface side of the base; the cutting machine body comprising: a circular saw blade protruding downwardly through a window portion provided on the base and cutting into the cutting material; a fixed shroud covering a circumferential outer side of the circular saw blade; a metal chip guide tube provided within the fixed shroud and surrounding a partial circumferential outer side of the circular saw blade, including a chip guide cavity and an inlet communicating with the chip guide cavity; a movable shroud rotating relative to the fixed shroud and capable of covering a partial circumferential outer side of the circular saw blade; characterized in that: a guide portion is provided within the fixed shroud near the inlet, guiding the chips blown from a cutting point to the inlet; at least a portion of the guide portion extends from a bottom of the inlet to a first opening end near the movable shroud when the portable circular saw is cutting.

2. The portable circular saw of claim 1, wherein, the guide portion is further connected or formed with a support portion, which fixes the metal chip guide tube and the fixed shroud.

3. The portable circular saw of claim 2, wherein, the fixed shroud and the support portion are integrally formed.

4. The portable circular saw of claim 1, wherein, the guide portion and the metal chip guide tube are integrally formed.

5. The portable circular saw of claim 1, wherein, the metal chip guide tube is integrally formed.

6. The portable circular saw of claim 1, wherein, the guide portion is provided in a flat plate shape, including a slit cut from a lower end thereof to allow the circular saw blade to enter the slit.

7. The portable circular saw of claim 1, wherein, the movable shroud has a first side portion and a second side portion, and a bottom portion connecting the first side portion and the second side portion; the guide portion abuts against the first side portion and the second side portion, respectively, when the portable circular saw is cutting.

8. The portable circular saw of claim 1, wherein, in a radial direction of the circular saw blade, a distance between a bottom of the guide portion and a center of the circular saw blade is greater than 75 mm and less than or equal to 79 mm.

9. A portable circular saw for cutting metal, comprising: a base having a lower surface side abutting against a cutting material, and a cutting machine body supported at least partially on an upper surface side of the base; the cutting machine body comprising: a circular saw blade protruding downwardly through a window portion provided on the base and cutting into the cutting material; a fixed shroud covering a circumferential outer side of the circular saw blade; a chip guide tube provided within the fixed shroud and surrounding a partial circumferential outer side of the circular saw blade, including a chip guide cavity and an inlet communicating with the chip guide cavity; characterized in that: a guide portion is provided within the fixed shroud near the inlet, guiding the chips blown from a cutting point to the inlet; the guide portion is further formed or connected with a support portion, which fixes the chip guide tube and the fixed shroud.

10. The portable circular saw of claim 9, wherein, the fixed shroud and the support portion are integrally formed.

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